Gulf Oil Spill

Oil containment booms cuts across a sand bar covered with birds on Pelican Island on Sunday, March 23, 2014, in Galveston, Texas. Dozens of ships are in evolved in clean-up efforts to remove up to 168,000 gallons of oil that make have spilled into Galveston Bay after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/ Houston Chronicle, Smiley N. Pool)

Vessels work with skimmers and oil containment booms in Galveston Harbor on Sunday, March 23, 2014, in Galveston. Dozens of ships are in evolved in clean-up efforts to remove up to 168,000 gallons of oil that make have spilled into Galveston Bay after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/Houston Chronicle, Smiley N. Pool)

A vessel surrounded by a sheen on the water near the Port of Galveston on Sunday, March 23, 2014, in Galveston, Texas. Dozens of ships are in evolved in clean-up efforts to remove oil that spilled into Galveston Bay after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/ Houston Chronicle, Smiley N. Pool)

Emergency crews work along a barge that spilled oil after it was struck by a ship near the Texas City Dike on Sunday, March 23, 2014, in Texas City. Dozens of ships are in evolved in clean-up efforts to remove up to 168,000 gallons of oil that make have spilled into Galveston Bay after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/Houston Chronicle, Smiley N. Pool)

Emergency crews work along a barge that spilled oil after it was struck by a ship near the Texas City Dike, Sunday, March 23, 2014, in Texas City. The barge that once carried some 900,000 gallons of heavy tar-like oil was cleared Sunday of its remaining contents, a day after the vessel collided with a ship in the busy Houston Ship Channel and leaked as much as a quarter of its cargo into the waterway. (AP Photo/Houston Chronicle, Melissa Phillip)

Dozens of ships sit idle off the coast of Galveston, Texas on Sunday, March 23, 2014. At least 33 vessels, including two cruise ships, are waiting to enter the Houston Ship Channel from the Gulf of Mexico after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/ Houston Chronicle, Smiley N. Pool)

The Royal Caribbean Navigator of the Seas and the Carnival Magic sit idle with dozens of other ships off the coast of Galveston, Texas on Sunday, March 23, 2014. At least 33 vessels, including two cruise ships, are waiting to enter the Houston Ship Channel from the Gulf of Mexico after a ship and barge collided near the Texas City dike on Saturday afternoon. (AP Photo/ Houston Chronicle, Smiley N. Pool)

A black sticky oily substance is shown along the beach at the Texas City Dike near the barge spill cleanup site Sunday, March 23, 2014 in Texas City. Officials say the material is consistent with how oil could appear when it impacts beaches. However it would have to be analyzed to determine its origin. A barge that once carried some 900,000 gallons of heavy tar-like oil was cleared Sunday of its remaining contents, a day after the vessel collided with a ship in the busy Houston Ship Channel and leaked as much as a quarter of its cargo into the waterway. (AP Photo/Houston Chronicle, Melissa Phillip)